<!DOCTYPE html>
<style>
#one {
    border: 4px solid darkgreen;
    background-color: green;
    width: 600px;
    height: 400px;
    padding: 4px;
}
</style>
This tests that, if the ancestor of the current full-screen element is removed, full screen mode will exit, and the document will render normally.  At the completion of the test, a green box should be visible. Click <button>go full screen</button> to run the test.
<div id="one"></div>
<div>END OF TEST</div>
